| Most of the traditionally recognized subgenera of Anchusa are also supported as monophyletic groups by both nuclear and plastid sequence data. |
| These ingroup species were chosen to represent each of the proposed subgenera and genera from previous phylogenetic studies. |
| Species and not genera or subgenera are considered the most appropriate units in biodiversity studies. |
| At the subgeneric level, the classification of Valeriana in subgenera and sections is difficult. |
| Popov's monograph of Cenozoic cardiid shell microstructure includes more than 62 genera and subgenera and 150 species. |
| The genus is about equally divided into two subgenera, those with pedicellate flowers and those with sessile flowers. |
